Tool holder



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Y u piieatieii.1iiai chto,1e42, senaiudnisasce i H I, 5Qlain1s. ](Cl.7758) u This inventionrelates to tool holders and more rotated about horizontal axis, this work piece particularlyto a device'for supporting a boring having a holegzll therein which is to be enlarged hair and adapted to be mounted on a-lathe or byboring. The boring operation-is performed by {the like; 7 it W 1 means of a boring bar Z Z oian-ysuitable corrhen boringa hole in a workpiece it i often .struction but p eferably in the formbtanelon- 'ol'*great importance'for ,the o'peratorfto" watch gated; ylindrical rod having acutting pointf 23 i the action of the cutting point of the t'oolg s'o projecting laterally from one end; This""cutting thathe may avoid cutting away too much *ma'tepointer bit may be integral with the wbar or rial or otherwise spoiling the work. Such inremovably secured thereon in known mannerw 'spection of the cuttingaction is'very difiicult and -10 The" present" inven'tionis concerned with the l in] many cases'impossible when 'pri'or'types of construction of'a holder 25 adapted'to support boring bar holders are employed. This is parthe boring bar 22 i alpositio sub tantially ep; ticularly true in the caseofdeep holes with comallel with the axis of rotation of theworkpiece parativelysmall diameters! In an attempt to ISI. This holder 25 c'ompris'es an-elongated-horisolve this problem, some operators permit the zontal shank 26 of rectangular cross-section, and boring bar to extend beyond the tool holder for a portion 21 integ al with the shank and exa distance considerably, exceeding the depth of tending transversely at one endthereof to form the hole, but this excessive overhang promotes a T-shaped structure as viewed fromabove. Two chattering, necessitates very fine feeding rates, substantially horizontal branches or fingers 29 and is far from satisfactory. extend from opposite ends of the transverse por- It is accordingly one object of the invention tion 21 to cooperate therewith in providing a bito provide a comparatively simple and dependable furcated head, these fingers being located on the holder which will support a boring bar firmly and other side of the portion 21 from the shank 26. permit the operator to watch the action of the A transverse upw pen gr e 30 is p d cutting oint. in the upper surface of each finger 29 at sub- It is a further object of the invention to pros a a ly right angles with the shank 26, the video. boring bar holder so constructed and arnner wall of each groove having a V-shaped ranged that the overhang of the bar may be notch 3| therein. The two notches 3| are aligned. only slightly greater than the depth of the hole A substantially horizontal screw 33 is mounted to be bored, and yet the operator may watch the n t e Outer end of each finger in approximate cutting point as it approaches the bottom of the alignment therewith, these screws extending into 1 the grooves 30, with the ends of the screws op- With these and other objects in view, as will posed to the notches 3|. be apparent to those skilled in the art, the inw n utilizing e e t on, the shank 26 willbe vention reside in the combination of parts set inserted thmllgh the 510i; 0f t e 01 Dost I2,

forth in t specification and covered by t and clamped downwardly against the rocker shoe claims appendedhereto, n by means of the screw Is. The boring bar Referring to the drawing illustrating one em- 22 will be pl d in the grooves h n amount bodiment of the invention, and in which like ref- 0f overhang only sligh y exceeding the depth of erence numerals indicate like parts, 40

Fig. 1 is a perspectiv view of a boring bar to force the bar firmly into the notches 3|. By holder mounted on a, lathe and ready for use; lo sening the tool post screw l5 and sliding the and w rocker shoe I 7 in or out, the shank 26 can be Fig. 2 is a. section on the line 2-2 of Fig. 1. tilted as required t bring the cutting point 23' In the drawing I have shown the tool slide t0 the proper height, whereupon the screw l5 It of a. lathe, provided with theusuai T-slot II will again be tightened. During this adjustment to receive the lower end of an ordinary upright the boring bar will remain parallel with the axis tool post l2 with it customary slot M. The usual 01'' the work piece. The boring operation can now. clamping screw I5 is provided in the upper end p oceed, a d t perator can watch the cutting of the tool post. A Washer 16 with a concave action of the tool by looking along the top surface upper surface rests on the tool slide ID in surof, the boring bar from the right hand end thererounding relation to the tool post, and the usual 3 of. Since the construction of the holder 21 is such rockershoe l1 extends through the slot 14 and as to leave the top of the boring bar entirely rests on this washer. A work piece I9 is mountunobstructed, this inspection of the cutting action ed in thelathe chuck (not shown) and thereby is possible even as the tool 23 reaches the bottom having two substantially boring bar, and

of the hole 20 and the holder is located close to the work piece. Thus the invention provides great and important advantages in operation. Furthermore it is comparatively simple and inexpensive to manufacture.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A tool holder comprising a supporting shank, a head integral with the shank and provided in its upper surface with an upwardly-open groove extending at substantially right angles with the shank and adapted to receive a substantially horizontal boring bar or the like, and means to clamp the boring bar within the groove while leaving the top ofthe bar unobstructed.

2. A tool holder comprising a supporting shank, a head integral with the shank and provided in its upper surface with an upwardly-open groove extending at substantially right angles with the shank and adapted to receive a substantially horizontal boring bar, the groove having a notch in its inner wall, and means to force the boring bar firmly into the notch while leaving th top of the bar unobstructed.

3. A tool holder comprising a supporting shank, a bifurcated headintegral with the shankand horizontal fingers, each finger having a transverse upwardly-open groove in its upper surface, the-grooves being aligned and adapted to receive a substantially horizontal a substantially horizontal screw mounted in the outer end of each finger and extending into the corresponding groove to clamp the bar in place while leaving its upper surface unobstructed.

4. A tool holder comprising a shank, a bifurcated head integral with the shank and having two ubstantially horizontal fingers extending outwardly away from the shank, each finger having a transverse upwardly-open groove in its upper surface and a notch in the inner wall of each groove, the grooves being aligned and adapted to receive a substantially horizontal boring bar, and a substantially horizontal screw mounted in the outer end of each finger and extending into the corresponding groove, the screws being arranged to force the bar firmly into the notches while leaving its upper surface unobstructed.

5. A tool holder comprising a substantially horizontal shank, a portion extending transversely at one end of the shank to form a T-shaped structure as viewed from above, two substantially horizontal fingers extending outwardly from opposite ends of the transverse portion and located on the other side thereof from the shank, each finger having an upwardly-open groove in its upper surface and a notch in the inner wall of the groove, the grooves being aligned and adapted to receive a substantially horizontal boring bar, and a substantially horizontal screw mounted in the outer end of each finger and extending into the corresponding groove, the screws being arranged to force the bar firmly into the notches while leaving its upper surface unobstructed.

FREDERICK M. RAMSDELL. 

